html,
body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
}

.ybk {
    width: 100vw;
    height: 100vh;
}

.bottom {
    position: absolute;
    top: 88%;
    width: 100%;
    height: 50px;
    background-color: rgba(0, 0, 0, 0.5);
}

.footer {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 30px;
    background-color: rgba(0, 0, 0, 0.5);
    color: gold;
    z-index: 999;
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    justify-content: space-between;
    align-items: center;
}

img {
    height: 50px;
    padding: 2px;
}

.left {
    position: absolute;
    left: 0;
    top: 50%;
}

.right {
    position: absolute;
    right: 0;
    top: 50%;
}